Live updates from the 2014 Microsoft Build keynote in San Francisco, where new CEO Satya Nadella is expected to preview Windows 9 and other products.

Check back here for live updates Wednesday from CNN's Heather Kelly, who'll be posting from the event hall in San Francisco.

by bgriggs4/1/2014 8:43:42 PM

We are live at the Microsoft keynote address in San Francisco this morning. A hip DJ is playing some intense club music to warm up the sleepy audience.

by Heather Kelly4/2/2014 3:30:56 PM

First on stage is Terry Myerson, the executive vice president of Microsoft's operating systems group.

by Heather Kelly4/2/2014 3:32:28 PM

Joe Belifiore is up on stage now. He runs a group for PC, tablets and phones in the Operating System Groups. He's going to be talking about major Windows updates, starting with Windows phone 8.1 update.

by Heather Kelly4/2/2014 3:36:19 PM

He is showing off two new Windows Phones from new partners. There's one from Micromax another from Prestigio.

by Heather Kelly4/2/2014 3:38:08 PM

There's a new "action center" in Windows Phone 8.1. It's a notification and settings screen with battery percentage, notifications from social networks, and shortcuts for airplane mode and wireless connections. It can be brought up from any screen.

Halo NationWere you also looking for Cortana (level), which is a level in Halo 3? “This Galaxy is vast; its...

by Doug.Gross4/2/2014 3:50:11 PM

It determines who is in your inner circle based on your communications. If you want some down time, turn on quiet hours but allow a custom set of people to reach you. There are flight notifications, etc.

To get the necessary information about you, these personal assistant tools scan your calendars, email, and other personal accounts (with permission). Cortana also pulls information from Bing, Yelp and other databases of useful information.

by Heather Kelly4/2/2014 3:55:22 PM

The new Cortana voice assistant is represented by a pulsating blue circle.

by Heather Kelly4/2/2014 3:57:34 PM

Google Now is a powerful voice assistant that operates like Siri and Cortana, but it might suffer from a lack of personality. Should Google give in and give it a name?

by Heather Kelly4/2/2014 3:59:43 PM

There are a few glitches in the Cortana demonstration, but it's still in beta and seems to be working pretty well for a new hire.

by Heather Kelly4/2/2014 4:00:41 PM

Just so long as you don't see this ...

by Doug.Gross4/2/2014 4:02:31 PM

To be clear -- that blue screen is my lame attempt at humor, not something that actually showed up at the keynote.

by Doug.Gross4/2/2014 4:03:28 PM

Cortana does something called "people reminders." You can set reminders for future phone calls to remind you to bring up specific topics when you call someone. The example is asking a sibling about their new puppy. Good for people who are really bad at casual chit chat?

by Heather Kelly4/2/2014 4:04:16 PM

Cortana takes app-specific requests such as putting something specific on your Hulu queue or seeing what a buddy is doing on Facebook.

by Heather Kelly4/2/2014 4:06:09 PM

They played a quick Jimmy Fallon sketch in which Siri hears about Cortana and says "Oh it's on, b*tch." Because they're both female voices, you see.

by Heather Kelly4/2/2014 4:07:17 PM

Windows Phone 8.1 supports S/MIME which allows users to send and receive signed and encrypted emails on their phone.

by Heather Kelly4/2/2014 4:10:51 PM

Windows phone has added a couple of other features for business users, including the encryption.